Safety device.



D. M. WATKINS.

SAFETY DEVIGE.

APPLICATION FILED 213.13, 1907.

918,106. Patentd Apr.13, 1909.

DAVID M. WATKINS, OF PROVIDENCE, RHODE ISLAND.

SAFETY DEVICE.

Specification of Letters Patent.

Patented April 13, 1909.

Application filed February 13, 1907. Serial No. 357,144.

To all whom it may concern:

Be it known that I, DAVID M. ii ATKINS, of Providence, in the county of Providenceand State of Rhode Island, have invented certain new and useful Improvements in Safety Devices; and i do hereby declare the following specification, taken in connection with the accompanying drawings, forming a part of the same, to be a full, clear, and exact description thereof.

The invention relates to a safety device for jewelers presses, such as is shown and de scribed in my pending application Serial No. 306,590, filed March 17, 1906, which has become Patent No. 851,909, dated April 30, 1907, and more particularly to the means for limiting the movement of the safety device in one direction.

With the means shown in my former application it has been found that the arm of the safety device interferes somewhat with the removal and insertion of the stationary die by reason of the fact that its movement in both directions is limited to such an extent that it cannot be swung entirely away from the stationary die.

It is the object of the present invention to provide means whereby the arm of the safety device may be swung outward entirely clear of the stationary die and means whereby said arm may be automatically locked in said position, thereby giving sufficient room to manipulate the stationary die as desired.

To this end the invention consists in the novel construction and arrangement of parts hereinafter described and claimed, reference being bad to the accompanying drawings, in which Figure 1 is a front perspective view of a portion of a drop press embodying my improvement, Figs. 2, 3, i, 5 are enlarged plan views of my improved attachment for limiting the movement of the safety device, show ing said attachment in various positions.

Referring to the drawings, 1 represents the bed of the machine which is mounted upon suitable standards 2, and upon which is secured the stationary die or work-support 3. The standards 2 are provided with the uprights 4 having the ways 5 on their inner faces for the drop 6 to slide upon. Mounted in the bottom of the drop 6 is a movable die 7 and secured to the top of the drop is an operating strap 8.

Secured to one of the uprights 4 is abracket 9, in which is loosely mounted one end of a rock-shaft 10, the other end of said rockshaft being loosely mounted in the bed 1. Secured to the rock-shaft 10 so-as to move therewith is a plate or arm 11 which is arranged to swing across the stationary die 3 in close proximity thereto.

Secured. to the rock-shaft 10 is a cam-bar 12 constructed with a cam surface which, when the drop is in raised position, is located in the path of the drop 6 and is connected at its lower end with the arm 11. iligidly secured to the u per end of the rock-shaft 10 is a quadrant-shapcd arm 13 extending laterally therefrom and having side portions 14 and 15 adapted to engage a projection or stop 16 on the bracket 9, as hereinafter described.

The operation of the device is as follows: When the drop is in inoperative or raised position, the arm 11 is held by a torsional spring 17, mounted on the rock-shaft 10 between the bracket 9 and the cam-bar 12, at the rear of the stationary die 3 and the arm 13 occupies the position shown in Figs. 1 and 2. With the parts in this position the cambar 12 occupies a position directly beneath the drop 6 and in the path thereof. When the drop 6 falls either in the regular operation of the press or by accident, the lower outside edge of said drop engages the upper end of the cam-bar 12 and, as it slides along said cam-bar, it rocks the shaft 10 and swings the arm 11 forward across the die until the side 11 1 of the arm 13 engages the projection 16, as shown in Fig. 3. As the drop 6 is raised, the rock-shaft 10 will be returned to its former position by the spring 17 and will be arrested in its movement in this direction by the cam-bar 12 engaging the inside of one of the uprights 1, as shown in Fig. 1.

When it is desired to remove or insert the stationary die 3, the operator raises the rock-shaft10 by moving it longitudinally in its bearings so that the arm 13, when said rock-shaft is rotated, will ride over the projection 16, as shown in Fig. 1, and if the movement of the rock-shaft is continued until the arm 13 has passed. over the projection 16, the rock-shaft 10 will drop by gravity and the spring 17 will hold the side 15 of said arm 13 in engagement with the projection 16 and automatically lock the rock-shaft in this position, as shown in Fig. 5. Vi ith the parts in this position the arm 11, as shown in dotted lines in Fig. 1, is entirely clear from the stationary die, Which can then be maniputive position, as shown in Fig. 1.

With this construction it will be seen that the safety device can be quickly and easily thrown out of operation at any time and the press operated Without it, if desired. It will also be seen that, by varying the size of the quadrant-shaped arm, the sweep of the arm 11 may be varied to conform with different sized dies.

What I claim as my invention and desire to secure by Letters Patent is:

1. In a press or similar device, the combination, With the bed, of a stationary die mounted thereon, a rock-shaft having one end loosely mounted in said bed and the other end loosely mounted in a bracket secured to the frame of the press, a projection on said bracket, an arm secured to the rockshaft and adapted to engage and disengage said projection, a second arm secured to said rock-shaft and adapted to swing across the stationary die, and means for operating said rock-shaft.

to be operated by 2; In a press 'or similar device, the combinat on, with a sultable frame, of a statlonary rock-shaft operated by said movable carrier, an arm secured to said rock-shaft and adapted to swing between said dies, and'a quadrantvshaped arm secured to said rockshaft and adapted to'engage a stop to limit the movement of said rock-shaft.

3. In a press or similar device, the combination, with a suitable frame, of a drop mounted in said frame, a bracket on said frame provided with a projection, a rockshaft mounted in said bracket and adapted said drop, an arm secured to said rock-shaft and arranged to engage one side of the projection on the bracket DAVID M. WATKINS. Witnesses J. H. THnns'roN, W. H. THUn'sToN.

die, a die mounted in a movable carrier, a

when the rock-shaft is operated by the drop, L 

